Pedals that stack with the MXR CSP038 Brown Acid Fuzz

Zvex Seek Trem

Keep Zvex Seek Trem after MXR CSP038 Brown Acid Fuzz in the signal chain, clear of MXR CSP038 Brown Acid Fuzz's own gain stage

Walrus Audio Ages

Walrus Audio Ages stacks clean boost on top of the fuzzy already here

Pigtronix Octava

Pigtronix Octava layers octave onto an already fuzzy signal

Pigtronix Echolution

Put Pigtronix Echolution after MXR CSP038 Brown Acid Fuzz in the signal chain, clear of MXR CSP038 Brown Acid Fuzz's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Walrus Audio Melee Wall of Noise Black

Keep MXR CSP038 Brown Acid Fuzz's fuzzy voice out front: Walrus Audio Melee Wall of Noise Black goes after MXR CSP038 Brown Acid Fuzz in the signal chain so its ambient voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Acoustic Strymon Compadre Dual Voice Compressor

Run the Compadre before the Brown Acid Fuzz for transparent, studio-grade compression before that vintage psychedelic fuzz kicks in.